Attachment for drill



March-25, 1958 L. L. MEYER 2,827,807

ATTACHMENT FOR DR ILL Filed Feb. 21, 1957 JIE, 3

INVENTOR. L ES 7'51? L, MEYER 28 I 35 HIS flTTO A/FYS United StatesPatent F "ATTACHMENT FOR" DRILL Lester L.- Meyer,- Arcanum, "Ohio'Application February 21,1957, SeriaPNo'i 641,546

' 7.-Claims. ((1177-14) 'This invention relates toanatttichmen'tforelectric hand drills, the -attachment being adaptd'for usetin drawinga "work to 'be' drilledtoward the drill; although the adaptation of'theattachmentis' not necessarily'limited '16 hand drills.

An "object of'this' invention'is to providetan attachment for anelectric hand drill which serves;first;as a'h'andle for supporting thedrill; and; second; asia housing for an "assembly 'for'en'gaging thework to be drilled and to! drawing the work toward 'the drill; whichasser'riblyana; be actuated 'manually by an' operator; 'with'the samehand used-to'support the drilL'to draw the work in a stepwise mannertoward the drill.

Another object of this invention is to provide an attachmentfor a drillfor drawing a'work to be drilled "toward the drill; whereintheattachment includes means'for'yieldably drawing'thework towardthe drilland 'm'anuallypp- "erahle ratchet and pawl means for positively drawingthe Worktowardthe drill in a'stepwise manner. ,1" "Still another objectof this invention'is 'topr'ovide' an attachment for a drill for'drawinga work to be' drilled 'towardthe drill including a cableadapted'to'support the work and ratchet and pawl means for actuating"the cable, "wherein the ratchet'means'to which'the cable is secured isrotatably mounted so as to be rotatable with the cable.

Other objects and advantages reside 'inthe construction elf-parts; thecombination thereof, themethod' of'm'anufacture and the mode ofoperation; as will becomem'ore apparent from the following description.

In the drawing Figure 1 is a perspective view of an electric hariddiillillustrating the attachment which is the subject ofthis in- 'vention.

Figure 2 is an elevational view with-'portions shownin section,illustrating the construction ofthe attachment and showing, in solid andbroken lines, 'two' positions -of a ratchet actuating assemblyassociated with the attachment.

Figure 3-is an elevational view, with'portionsshown in section,illustrating a third position of the ratchet actuating assembly.

Referring to the drawing in detail, Figure l'illustr'ates aconventional-pistol grip type electric hand drilI to which theattachment 12, which is the subject ofthis-Iinvention, is attached. Theattachment '12 comprisesa tubular handle portion 14, an actuatinglever.16, and a cable18,-which;:as=will'be described later; may beselecv tively drawn into and released from the -handle portior'il4. The.cable 18 is provided at one .end with a =hook-- 20 adapted to engage achain 21, or the like, looped around or otherwise. secured .to the work22'to be drilled. For the purposes. of illustrationsonly the work 22 isa wooden board or a metallic bar.

As" illustrated ,in Figure 2, the tubular handleyportion "14 is providedatone end with an externally'threaded portion' 24 for attachment to thehand'drill 10, and is pro- 'vided at the other end with anintern'allythreaded portion 26 adapted-to receive aplug 28.

The handle portion is" threadedly secured to the drill 2,827,867Patented Mar. 25,1958

' housing so as to extend substantially normal to'the rota- 0 whichextends-"almosttheentire length-thereof. I Atcoil ;spring 34 extendingwithin the boring 33is anchored at the inner eiid offthe'boring -33itothe ra'tchet-ba1= 30 by a pin or 'rivet '36 which is welded,press-fitted, or otherwise secured in place. .Thelspring34 is anchored-atthe other end thereofttoT-theplug '28by a suitable pin -or rivet 38.The construction of the vspring 34 is such that whenthe ratchet bar 30rests uponlthe plug -28,the spring is under Aaslight tension. As'theratchet,bar 30 isppulled away lfrom l the Plugj'ZSjthtehsion ofthetspring increases; tendling to draw the ratchet bar back toward theplug =28. The 4 c'abl'18, secured to theend'of the ratchetbar- 30opposite the spring 34, extends from-the ratchet bar 30 out of'thea-handle portion 14 through an iopeningintthe wall" thereofadjacent'thethreaded portion 24 at the .end of thehandle portion-14. 5Th-length of .the cable 18-is approximately .halfI'thet-leng-th 'ofthehandle portionv 14.

f'The cable 18; in passing out ofsthe handle portion 14, passes over a;'eue' 40 journalledupon ashaft- 42. sup- I ported: between spacedbrackets onfplates 44 weldedto opposite, .sidesu'of -the handle 3portion l4-adjacent the threaded portion 24. These parallel plates '44are recessed partiallyinto a the peripheral w all ofathe tubular handleportion 14. The actuating lever: 16 is also'pivotally selcuredtotheplates 44 upona shaft 48. -This -le-ver-is adapted to be pivotedbetween a position parallel-10 and adjacent the handle portion. 14,asishownd'n broken line -detail in Figure ,2, and positions antiparallelto the handle 9 portion 14, one bf which :isflshown in solidvline detailin (Figure 2. "Y he lever 16 is rounded on the surface-facing awayfromfthe handle porti0n'=14, such that an: operator may-convenientlygrip SimutaneOuSIy-thehandie portion a 14 and lever 16.

"Pivotally securd tothe lever16 =uponashaft-5tl=isa pawl '52. The; pawl52: is adapted'to-project QHHQ the 45 handle. portions v14 through anopening-provided therefor .ini'the wall of the handle; portion liinto-engagement with [the "ratchet. bar 30. The; pawl 52 when engagingthe ratchet bar'30 opposes movement of the ratchet'bar 530 in-.opposition -to thespring'34. Thepawl-SZ-is-pro- 5o vided with-abifurcated arm. portion 54 engaging the lshaft'lsib. The bifurcated armportion I 54: straddles a hairpin spring element 56, one legof which :isnestled within the lever 16 and theother legof-whicht-bears against thepawli52-,-iso as to-urge the pawl-52 intotantiparallel relationship tothe lever 16. In toperatiom-the springSG tends to urge-the pawl 52 intoengagement with the ratchet bar30 and simultaneouslywtends-to bias thelever 16 antiparallel to the handle portion 14. A second'pawl'58ispivotally secured to a U-shaped bracket memb'er 6.0 welded tothethandle portionll tiintspaced relation "to'the pawl- 52 A leat springmember 52f-fixedly seic'ured to the"'bracket member 'fianrges the awrssinto engagemenf'w'ith the ratchet 'bar '30. a The construction I ofthe"pawl"'58,"'like 'thattof the pawli52, is such as to 5 resistmovement 'of the ratchet bar30 in opposition to the spring34. I V V Itis"to'ibe noted 'thatthe'fshaft 50, supporting the pawl -52; is spaced:from'the shaft 48,isupporting the lever 16, such thatljas'the lever16"isjpivoted'trom1the solid line position shown' inhigure' 2tosubstantial parallel relation with the handle portion 14,"'as'shown'ia'br'oken hne in Figure 2,"-'the pawl 52' is' caused "to"rnoveairially so as to drive the ratchet bar 30 asazsort-t V V 14toward the plug 28. The arrangement is such that the' axial movement ofthe pawl 52, as the lever 16 is moved manually into parallel relationwith the handle portion 7 14, exceeds the spacing between notchedportions 32 on the ratchet bar 30. As the ratchet bar 30 is drivenaxially by the pawl 52, the pawl 58 is caused to jump a notch on theratchet bar and then to l e-engage the ratchet bar a 30. On subsequentrelease of the lever 16, which under the actionof the spring 56 ispivoted outwardly from the handle portion 14, the pawl 52 jumpsta notchon the ratchet bar 30.

Clearly, by repeated manual actuation and release of A the lever 16, theratchet bar 30 may be driven axially in the handletportion 14 toward theplug 28, thus drawing the cable 18 over the pulley 40'into the handleportion 14.

The cable 18 may be subsequently withdrawn from the .7

' ure 2 such that the arcuate, surface 66 of the pawl 52 engages andpushes against the tongue 64 of the pawl 58 and simultaneously thearcuate surface 68 of the pawl 52 engages the lip 70 associated with thehandle portion 14. Clearly, thesprings 56 and 62 are in opposition whenthe lever 16 is in this position. Due to the low mechanical advantageassociated with the spring 56 in this position, however,;the spring 62prevails and urges the pawl 58 into positive engagement with the ratchetbar 30.

By manually urging the lever 16 away from the handle portion 14 to theposition shown in Figure 3, the arcuate surface 68 of the pawl 52 may becaused to camupon the lip 70 of the handle portion 14 against the tongue64 of the pawl 58, so as to move the pawl 58 out of engagement with theratchet bar 30 in opposition to the spring 62. By such movement of thelever 16, both pawls 52 and 58 may be caused to simultaneously disengagethe a ratchet bar 30. Outward movement of the lever 16 from the handleportion 14 is limited by an abutment 72 associated with the plates 44which engages a complementary abutment 74 associatedtwith the lever 16.

When-the lever 16 is manually pivoted to this extreme antiparallelposition, the cable 18 may be manually withdrawn from the handle portion14 by grasping the hook 20 attached to the cable18 and'pulling the cable18 in opposition to the spring 34. When the cable 18 has been withdrawn,the handle portion of the lever 16 may -'be returned to theintermediatenon-parallel position,

shown in Figure 2 in solid line'detail, whereupon the pawl 58 'willengage the ratchet bar 30. v V

The operation of the device is as follows: After actuating the lever 16to its extreme antiparallel position with respect to the handle portion14, as shown in Figure 3,

the cable 18 may be manually withdrawn from the handle portion 14,whereupon the hook 20 may be attached to a chain or the like forsupporting the work to be drilled. The spring 34, opposing withdrawal ofthe cable, 18 from the handle portion 14, operates to draw the cable 18back into the handle portion 14 to take up slack in the cable 18 andwork engaging chain. Subsequently, the lever '16 is returned to theintermediate,antiparallelposition,

shown in solidline detail in Figure 2, and thedrill is put intooperation. peatedly, while simultaneously supporting the drill'by thehandle portion 14, the ratchet bar 30 may be driven axially in thehandle portion 14 so as to cause the drill to pene- 58 serves to tratethe work. In this operation, the pawl prevent slippage of theratchetbar'30.

So that the lever 16 maybeproperlyoriented 'on the By manually actuatingthe lever Hire-- axially in the handle portion handle portion 14 forconvenient actuation while the drill is being operated, the end of thehandle portion engaging the drill housing is provided with internalthreads at 49 for receipt of a tapered plug 51. The depth of the plug 51in the handle portion 14 is adjusted such that when the handle portion14 is turned tightly into place in the drill housing, the handle portion14 has the proper angular orientation relative to the drill housing. Tofacilitate adjustment and locking of the plug 51,-the handle portion 14is split at 53.

It is to be noted that the ratchet bar 30 which is rotable in the handleportion 14 is capable of rotating'with the cable 18. Thus, while thecable 18 may ordinarily tend to twist during the drilling operation andthus besubjected to harmful torsional stress, such a result is precludedin the present invention.

Although the preferred embodiment of the device has been described, itwill be understood that within the pur- 7 view of this invention variouschanges may be made in the form, details, proportion and arrangement ofparts, the combination thereof .and mode of operation, which generallystated consist in'a device capable of carrying out the objects setforth, as disclosed'and defined in the appended claims.

7 Having thus described my invention, I claim: 7 1. An attachment for anelectric hand drill including .a tubular handle portion attachable atone end to the drill housing and adapted for use in holding the handdrill, a ratchet bar mounted for reciprocal axial movement in saidhandle portion, said handle portion having an open- 7 ing in the wallthereof, a cable having one end secured to said ratchet bar passingthrough said opening and having the other end thereof adapted to supporta work to be drilled, a lever pivotally secured to said handle portion,the construction and arrangement being such that said lever may beactuated manually by an operator with the ,same hand used to hold thehandle portion, and pawl means responsive to pivotal movement of saidlever for actuating said ratchet bar axially in said handle portion in astepwise manner so as to-draw said cable into said handle portionthereby drawing said work towards the 'drill.

2. The attachment according to claim 1, wherein said ratchet barcomprises a substantially cylindrical member provided with axiallyspaced annular notched portions adapted to be engaged by said pawlmeans, and wherein,

said ratchet bar is mounted for rotation in said handle portion.

- 3. The attachment according to claim 1, including spring means biasingsaid ratchet bar axially in said' handle portion so as to exert a springtension tending -to draw said cable'into said handle portion.

4. An attachment for an electric hand drill including i a tubular handleportion attachable at one'end to the drill housing and adaptedto extendsubstantially normal to the axis of rotation of the drill, a ratchet barmounted for reciprocal movement in said handle portion, said handleportion having 'an opening in the wall thereof, pulley means secured tosaid handle portion adjacent the .opening therein, a cable having oneend thereof secured 'to said ratchet bar passing out of the opening insaid handle portion over the pulley means, said cable being adapted atthe other end thereof to support a Work to be drilled, a lever pivotallysecured to said handle. portion and having a first positionsubstantially parallel to said handle portion, spring means biasing saidlever into a t second position antiparallel to said handle portion, the

construction and arrangement being such that an operator grasping saidhandle portion to hold said drill may,

with the sarne h'and', actuate said lever repeatedly from i said secondposition to said first position, and pawl means :responsive to movementof said lever for actuating said ratchet bar axially in said handleportion in a stepwise manner so as to draw said cable into said handleportion thereby drawing the work supported by said cable towards saiddrill.

5. The attachment according to claim 4, wherein said lever has a thirdposition in extreme antiparallel relation to said handle portion, andincluding cam means responsive to movement of said lever to said thirdposition for disengaging said pawl means from said ratchet bar, andspring means urging said ratchet bar axially in said handle portion soas to draw said cable into said handle portion when said pawl means isdisengaged from said ratchet bar.

6. The attachment according to claim 4, wherein said ratchet barcomprises a substantially cylindrical member provided with axiallyspaced annular notched portions adapted to be engaged by said pawlmeans, and wherein said ratchet bar is mounted for rotation in saidhandle portion.

7. The attachment according to claim 4, wherein the end of the handleportion attachable to the drill housing is provided with an externallythreaded portion for threadedly engaging the housing and an internallythreaded portion, and including a tapered plug threadedly engaging saidinternally threaded portion so as to adjustably engage said handleportion, the construction and arrangement being such that said piug maybe adjusted to enable positioning of'said handle portion in apredetermined angular relation to said housing, said handle portionhaving a split portion in the end thereof receiving said plug providinga spring tension for locking said plug in position.

References Cited in the file of this patent UNITED STATES PATENTS2,097,949 Johnson Sept. 1, 1936 2,695,525 Butenhoff Mar. 3, 1950

